Generally speaking:

Male: The bones are thick, the surface is rough, and the bones are dense and thick. Male pelvis is thick, the entrance is heart-shaped, the pelvis is high and narrow, and it is funnel-shaped, and the pelvic outlet is narrow.

Seen from the pelvis, female bones are thin and smooth. The female pelvis is a shallow and wide cylinder. The entrance above the pelvis is an oval with a horizontal width and a vertical width, and the exit below is relatively wide, forming a circle for the fetal head to pass through.

Judging from the skull:

The male has a large skull, thick texture, long and narrow face, protruding eyebrow arch, basically square eyes, high and thick cheekbones and thick mandibular joints.

The female skull is small, thin in texture, short and wide in face, inconspicuous in eyebrow arch, basically round in orbit, low and slender in cheekbones and slender in mandibular joint.